While I'd personally hang up on these crooks, they obviously know if they call enough people they'll find somebody who they can bully, scare, con, or otherwise pressure into buying their crap.
Same principles apply if we're talking Nigerian princes, MLMs, Kirby vacuum cleaner salesmen, pump and dump stocks, Microsoft "technical support" ringing about a virus they detected, timeshare, or some other questionable business proposition. They'll work knowing that even if only a tiny % of people respond to their activity it is still profitable. Even worse, once the scammers have found a mark they'll hit them again and again, or even trade their marks to other scammers.
So it's good to see the law give them a clobbering in return.